Stabilization of compositions comprising quaternary trialkylalkanolamine hydroxide

Abstract

A composition comprising a) a quaternary trialkylalkanolamine hydroxide and b) at least one diamine as component b), which is selected from the group consisting of 1-amino-4-methylpiperazine, 1,2-diaminopropane and mixtures thereof.

The invention claimed is: 
     
       1. A composition comprising a) a quarternary trialkylalkanolamine hydroxide and b) at least one diamine as component b), which is selected from the group consisting of 1-amino-4-methylpiperazine and a mixture of 1-amino-4-methylpiperazine and 1,2-diaminopropane. 
     
     
       2. The composition according to  claim 1 , wherein component b) is 1-amino-4-methylpiperazine. 
     
     
       3. The composition according to  claim 1 , wherein component b) is the mixture of 1-amino-4-methylpiperazine and 1,2-diaminopropane. 
     
     
       4. The composition according to  claim 3 , wherein the weight ratio of 1-amino-4-methylpiperazine to 1,2-diaminopropane is in the range of 1:9 to 9:1, preferably of 1:9 to 4:6. 
     
     
       5. The composition according to  claim 1 , wherein the component a) is N,N,N-trimethyl-hydroxyethyl-ammonium hydroxide. 
     
     
       6. The composition according to  claim 1 , wherein the concentration of component a) is in the range of 5 to 60% by weight, preferably in the range of 20 to 60% by weight, based on the total weight of the composition. 
     
     
       7. The composition according to  claim 1 , wherein the concentration of component b) is in the range of 0.1 to 3% by weight, preferably in the range of 0.1 to 1% by weight, based on the total weight of the composition. 
     
     
       8. The composition according to  claim 1 , which is an aqueous composition. 
     
     
       9. The composition according to  claim 1 , further comprising at least one component c) selected from the group consisting of N,N-diethylhydroxylamine, diethylentriamine, ethylenediamine, hydroxylamine or hydroxylamine salts. 
     
     
       10. The composition according to  claim 9 , comprising 1-amino-4-methylpiperazine and N,N-diethylhydroxylamine. 
     
     
       11. The composition according to  claim 10 , wherein the weight ratio of 1-amino-4-methylpiperazine to N,N-diethylhydroxylamine is in the range of 1:9 to 9:1, preferably 4:6 to 6:4. 
     
     
       12. The composition according to  claim 1 , further comprising at least one component d) selected from the group consisting of tert-butylcatechol and 4-methoxyphenol. 
     
     
       13. The composition according to  claim 12 , wherein the concentration of tert-butylcatechol is in the range of 0.005% by weight to 0.1% by weight, preferably in the range of 0.01% by weight to 0.05% by weight, based on the total weight of the composition. 
     
     
       14. The composition according to  claim 1  further comprising at least one component e), which is different from component c) or d), which is selected from film forming amines, corrosion inhibitors, defoamers and/or antifoams, demusifiers, antifoulants and mixtures thereof.